# Posts by Jess

Total # Posts: 1,088

**Chemistry**

A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X?

**Physics**

A car and driver weighing 7740 N passes a sign stating “Bridge Out 27.7 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 12.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done stopping the car if ...

**Geometry**

Quadrilateral GHIJ is a scale drawing of quadrilateral ABCD with a scale factor r. Describe the following statements as always true, sometimes true, or never true, and justify your answer. a. AB/GH = BC/HI b. perimeter (GHIJ) = r * perimeter (ABCD) c. Area (GHIJ) = r * area (...

**Physics**

A 65.0 kg ice skater moving to the right with a velocity of 2.5 m/s throws a 0.15 kg snowball to the right with the velocity of 32.0 m/s relative to the ground. a. What is the velocity of the ice skater after throwing the snowball? disregard the friction between the skates and...

**Chemistry**

If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions? 2 CO (g) + O2 (g) ---> 2 CO2 (g)

**statistics**

The following contingency of frequencies is based on a 5-year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G, respectively. Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% ¡Ý0.10% ...

**linear equation**

john invested $4000 into stocks(s) and bonds(b). The stocks earned 7% interest. the bonds earned 9% interest. if the investment earned $300, how much money did john have in stocks and bonds. my question- how do I write this formula so I can find the answer

**history**

I think the answer is C

**history**

15. The Articles of Confederation called for which of the following? A. The right of the legislature to assess taxes B. The Northwest Ordinance C. A single legislative body D. A chief executive

**Geometry**

Write a proof. 1. Prove: If the diagonals of a parallelogram are perpendicular, then the parallelogram is a rhombus. 2. Prove: If the diagonals of a parallelogram are congruent, then parallelogram is a rectangle.

**bookkeeping**

the amounts that increase the cash account are entered in what column?

**chem**

A weak acid, HA, has an ionization constant of 9.29 x 10-6. If we prepare a solution that is 0.727 M in HA what percent of the acid will be ionized?

**chem**

The Ka of an acid is 6.3 x 10-8. To the nearest one hundredth, what is its pKa

**Chemistry**

1. Write a balanced molecular equation for the reaction of solid AgNO3 with aqueous NaCl. Be sure to include the correct number of coefficients and the state of the species (aq, s, l or g). 2. Write the total ionic equation for this reaction, including all physical states. 3. ...

**Chemistry**

1. A combination reaction may also be a displacement reaction. True or False 2. The combustion of an element is always a combination reaction. True or False For number 1, I first thought true, but then again, nothing is being displaced in a combination reaction, right? You are...

**Physics**

Mass 1 with a unknown mass starts at rest at the top of a frictionless from a height of 13 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is 25.4 kg and initially at rest. After ...

**Chemistry**

Sorry for the double post. Just saw that my original question actually posted though I was told it had not.

**Chemistry**

A 0.2800 g sample of an unknown acid requires 28.22 mL of 0.1199 M NaOH for neutralization to a phenolphthalein point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? If I...

**Chemistry**

A 0.2800 g sample of an unknown acid requires 28.22 ml of 0.1199 M NaOH for neutralization to a phenolphthalein end point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? ...

**Math**

In three successive years the price of the common shares of Bedrock Resources Ltd. fell 40%, 60%, and 70% ending the third year at 50 cents. a. What was the share price at the beginning of the three-year skid? b. How much (in dollars and cents) did the share price drop in the ...

**STATISTICS HELP!!!!!**

That's what I got is it correct?

**STATISTICS HELP!!!!!**

a. 0.214 b. 0.787

**STATISTICS HELP!!!!!**

Bender Electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 175 boxes, each box containing 30 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...

**Science Density**

Water has a density of 1.0g/cm3. Aperson sits in a bath 150cm in length and 90 cm width. Thw water had a depth of 60cm befor the person sat in the bath. after sitting in the bath the water level rose to 68cm. Calculate the mass of the person, giving your answer in kg.

**Science -Density**

gold has a density of 19.30 g/cm3 . What si the mass of a bar of gold 15 cm x5 cm x 8 cm

**Chemistry**

Use standard enthalpies of formation to determine ΔHorxn for: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enter in kJ.

**S.S.**

The answer to 12 is Alexander Hamilton

**College question**

Thanks!

**College question**

I did my personal essay but I'm not sure if that's the one I'll be submitting. I might rewrite it. I'm applying to city college, hunter, university at buffalo, pace university, binghamton university, le moyne college, st.john's university, and hofstra ...

**College question**

I checked and it said they accept scores between 1660 and 1980, so I don't think they really look at writing. And for the transfer students they don't look at sat or act scores

**College question**

My math score was 570 Writing 570 Reading 550

**College question**

Thank you!

**College question**

Sorry, Stony Brook University

**College question**

I'm a high school senior and I'm planning on applying to SBU. I have a 4.0 gpa, a 1690 on the SAT(am going to retake), a 24 on the ACT, took 3 AP classes and am currently taking 2 more, part of National Honor Society, in the top 5% of my school, have an advanced ...

**Algebra 1**

I have been trying to figure out how to solve multi-step equations. Such as 1/2x+1/4x=16. How do you solve these? I can't seem to figure it out.

**English**

16. If an adverb modifies a verb, where should you generally place it in a sentence? A. At the end of the sentence B. Near the verb. C. Before the verb D. Anywhere in the sentence

**Finite**

A box contains 8 blue balls, 3 white balls, and 5 red balls, and that we choose two balls at random from the box. What is the probability of neither being blue given that neither is white?

**CHEMISTRY**

How to determine direction of polarity? For instance im studying from a practice quiz, an it says that in CH3OH the oxygen is slightly negative, which is understandable as its next to F. but then it says the H is slightly positive. why the H and not the carbon which is two ...

**Organic Chemistry**

Label each reactant according to it role or roles in the chemical reaction? Two different (OH-) + (HBr) ----> (HOH) + (Br-) (OH-) + (H3CBr) ----> (H3COH) +(Br-) Lewis base, bronsted base, nucleophile, lewis acid, bronsted acid, nucleophile

**Organic Chemistry**

Consider the resonance structures for the carbonate ion. O--C-O(-) l O(-) (-)O-C--O l O(-) (-)O-C-O(-) l l O How much negative charge is on each oxygen of the carbonate ion? A)0, B) -.33, C)-.50, D) -.67, E)-1.00, F)-1.33, G)-1.50, H)-1.67, I)-2.00 What is the bond order of ...

**CHEMISTRY**

if you copy the link from beginning to end itll paste easily into a search bar.

**CHEMISTRY**

Ch3CN(CH3)C2H5 is my kekule drawing ok? I drew it and uploaded a picture. oi61. tinypic . com/2vmztir.jpg

**calc**

Two paths represented by [x, z] = [-82.2, 43] +s [0.2, 1.7] and [x, y] =[-84.4, 45.5] +t [2.4 -0.9]. Determine the intersection of the two paths.

**Chem URGENT**

How much energy (in kilojoules) is released when 13.3g of steam at 114.5∘C is condensed to give liquid water at 67.0∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...

**Pre-Algebra**

How would I also solve the following? f(x)=x^2-4+3 what is the output of f(-3)?

**Pre-Algebra**

n(n-1)-4 How do I solve stuff like this?

**English**

This piece focuses on the increase use of smartphones of youths in South Korea. Should I reword that phrase?

**math**

A Jewlery box has length of 3 and a half, a width if 1 and a half, and a height of 2 units. What is the volume if the box I cubic units? Each of the cubes in this activity has a side length of 1/2. How many cubes with side length 1/2 does it take to form a unit cube? How many ...

**us history**

can you check my answers please? The “silent majority” referred to A. conservative working- and middle-class citizens B. women C. a liberal coalition of ethnic minorities, women, the aged, and the poor D. the nation’s youth E. deaf-mutes in government programs I...

**Class Board**

Characteristics and talents that will make me a great leader and member of Class Board is that I am helpful. Helping with homework, simple tasks, struggles that one faces, or providing ideas is a way of how I exemplify this characteristic. I also enjoy doing volunteer work. ...

**Class Board**

Would volunteering be considered as a talent/characteristic?

**Class Board**

What characteristics and talents in addition to these do you possess that will make you a great leader and member of the class board and how do you exemplify those? I don't really understand the part where it says "exemplifies" what does that mean?

**Geometry**

In a garden, a birdbath 2ft 6 in. tall casts an 18-in. shadow at the same time an oak tree casts a 90-ft shadow. How tall is the oak tree?

**english essay**

Ofcourse, I know Science and Chemistry are not issues but I want to know an issue related to this particular subject.I do not If you understood or not.

**english essay**

* I need help writing research essay. The topic is to write about an issue or problem that you want to change. Well, I am mostly interested in Science, particularly Chemistry and Nature.

**Math**

the directions for lemonade say to put 2 cups of liquid concentrate into one gallon of water. if olivia only wants to make one pint of lemonade, how many fluid ounces of concentrate should she put?

**biology**

I need help with what is happening inside the mitochondria. may help me what's happening 0-50 secondes. h t t p: // w w w.y o u t u b e.c o m / watch ?v=RrS2uROUjK4

**Chemistry**

What is the pH of a solution whose [H3O+] is 1 X 10 -6 M?

**Pre-Algebra**

I don't have an account. It says that you need one

**Pre-Algebra**

How do you find the surface area of cones and cylinders?

**SCIENCE**

ya what about number 4

**Cyber Community Citizenship**

Ayy im doing alrighty

**history**

As president, Grover Cleveland antagonized A. Western cattlemen and businessmen by restoring many acres of public lands to the federal government B. Democrats by putting many of his fellow Republicans into political positions C. Mugwumps by allowing “pension raids” ...

**us history**

The intellectual leader of the Social Gospel in America was my book speaks of William Rainsford, Washington Gladden, and Walter Rauscchenbusch but doesnt say who the actual leader is?

**us history**

Urban political bosses were often the largest source of assistance for city dwellers. true or false? this is true right?

**us history**

The growth of the railroads was a major cause of American expansion in the late nineteenth century. true or false? is this true?

**English**

correct the following sentence: elvis our cat play with his toy and then he played on the scratching post There are 6 errors but I could only find 5. Elvis, our cat played with his toy, and then he played on the scratching post.

**Math**

It is composed of 12 regular pentagonal faces.

**Math**

hey anonymous im in ninth i was in 8th last year . hey krystal be nice u need to calm down and learn to be nice!!!!!!!

**poem the voice by pat mora**

idek

**math**

thank you :)

**math**

Four runners ran the relay, Bill ran his lap in 22.738 seconds, Troy ran in 21.874 seconds, Grace ran in 20.32 second, and Jessica ran 19.047 seconds. Estimate the team's total time to the nearest tenth of a second

**math**

ok so it would be 4.25, 5, 6.5, 7.25

**math**

complete the sequence of numbers 4.25, 5, 5.75, _______, ______ ?

**math**

Writing to explain: The digit 5 is usually rounded up, but it can also be rounded down. How would you round the numbers in the equation 9.5 +4.7+3.2+7.5= to the nearest whole number without getting an overestimate or an underestimate?

**business math**

compute the amount of compound interest earned in 1 year for an investment of 1,000,000 with a nominal interest rate of 8% compounded quarterly.

**law**

judges in custody cases may interview the subject children outside the presence of the parents only if the attorneys are present? is this true or false

**Geometry**

Quadrilateral RUBY is a rectangle. Which of the following statements MUST be true? Check all that apply: [] All four of the sides of RUBY are equal. []All four of the angles of RUBY are equal. []RUBY has two pairs of parallel opposite sides.

**Calculus**

Gerber Banana Plum Granola costs $0.89 per 5.5-oz serving; each serving contains 140 calories, 31 g of carbohydrates, and 0% of the recommended daily allowance of vitamin C. Gerber Mixed Fruit Carrot Juice costs $0.79 per 4-oz serving; each serving contains 60 calories, 13 g ...

**Finance - Capital Budgeting/Cost-cutting**

Caradoc Machine Shop is considering a four-year project to improve its production efficiency. Buying a new machine press for $560,000 is estimated to result in $210,000 in annual pre-tax cost savings. The press falls into Class 8 for CCA purposes (CCA rate of 20 percent per ...

**Finance - Capital Budgeting/Bid Price**

We have been requested by a large retailer to submit a bid for a new point-of-sale credit checking system. The system would be installed, by us, in 89 stores per year for three years. We would need to purchase $1,300,000 worth of specialized equipment. This will be depreciated...

**SCIENCE (Drugs)**

dopamine

**Accounting**

Here is the income statement with all the numbers and accounts (This is a university in Canada by the way) i42. tinypic. com/ ws4i91. jpg (copy and paste without the spaces)

**Accounting**

I am doing a report on finding the major challenges in the future of my university with regards to their revenue and expenses. I have to discuss the main financial obstacles faced by the university and explain why each presents problems with future planning / budgeting. On the...

**Calculus - Integrals**

The projected rate of increase in enrollment at a new college is estimated by dE/dt = 6,000(t+1)^-3/2 where E(t) is the projected enrollment in t years. If the enrollment is 3,000 now (t=0), find the projected enrollment 15 years from now.

**algebra**

how do you find the x & y intercept of the equations y=-3 x=4 without graphing them?

**Calculus - Optimization**

A fence is to be built to enclose a rectangular area of 800 square feet. The fence along 3 sides is to be made of material $4 per foot. The material for the fourth side costs $12 per foot. Find the dimensions of the rectangle that will allow for the most economical fence to be...

**Calculus - Optimization**

A parcel delivery service a package only of the length plus girth (distance around) does not exceed 24 inches. A) Find the dimensions of a rectangular box with square ends that satisfies the delivery service's restriction and has a maximum volume. What is the maximum ...

**Calculus**

What would the derivative of c(x) = (10 - x) + 1.4*sqrt((x^2) + 25)

**Math**

Does an x and y intercept of 0 mean that there is no x or y intercept? Or is 0 an intercept?

**Calculus**

P(x) = 12x / (1-x) What are the critical points and where is P(x) increasing and decreasing?

**Calculus**

Find the critical points of f(x) = 0.05x + 25 + (180/x)

**Grd 12 Math**

Can someone please help me work out how to get to the answer of: tanx + tan (pi-x) + cot (pi/2+x) = tan (2pi-x)

**Calculus**

Given V(t) = 125,000e^(t/8) find V('t)

**Math - Derivatives/Logrithms**

An office machine is purchased for $6000. Under certain assumptions, its salvage value, V, in dollars, is depreciated according to a method called double declining balance, by basically 71% each year, and is given by V(t) = 6000(0.71)^t, where t is the time in years after ...

**Accounting - please check my answers**

Dogwood florist opened a business January 1st 2010. During 2010, they had the following transactions and economic events. For each of the transactions and economic events prepare the adjusting entries and show the related transaction entries at the date that each would be made...

**math**

the length of a rectangular garden plot is twice the width of the plot.if the fence around the garden is 600 ft long,what is the length of the garden plot?

**math**

i meant the last problem you typed

**math**

the problem is r^3r^4/r^-2r^-5